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25 January, 05:27

Factorise completely: 9x2 + 42x + 49

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  1. 25 January, 06:48
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    This is a perfect square trinomial:

    9 x² + 42 x + 49 = (3 x) ² + 2 · 3 x · 7 + 7² =

    = (3 x + 7) ² = (3 x + 7) · (3 x + 7)
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